10-9-23, don't know if this trick is out of the bag but last night i had to beat a piston out of one, the piston was beyond help. the caliper wasn't far behind, but figuring it would fall into the trash pile, then figured, give it a try, and don't know until i don't try. so i got out the foil roll and rolled up a rope of foil and just by a finger hone job for about 20 or 30 minutes under dripping water, rubbed it round and round until spots of whatever the parent metal is began to appear. they got bigger, and a couple of spots took longer, but i focused on those instead of the whole cylinder, but keeping it concentric as ever by just the finger hone. looks beautiful. the whole inside looks nearly new, and i had beat the puck out of it to get it out. now i'll try to find a piston and master cylinder laying around and if i get an oring for it, i'll do a test on the caliper, i could mic it, but first it's gotta work to put in that much technical measuring, besides i'll reset the factory tolerances to the new "working" limits.
update: found a piston and put the old sealing oring in the caliper, found some disc pads with some life on them, now only to find the bolts to afix it to the front wheel. i found a master cylinder and enough parts there to put it together, to put that on and go over some loose bolts, hopefully in a few days, it's been a couple months working on a new 400f project in the living room. things to do:
put on the exhaust,
the headlight,
get a battery,
tank,
seat,
attach the brake light switch
and then see if it's getting oil pressure.
start it. in the living room first.
if it doesn't start i wont have to walk it out the front door and back for nothing.
